Category Archives: Design

From Swimming to Synchro

FROM SWIMMING TO SYNCHRO: WHAT CHANGES IN THE POOL DESIGN?

Are interested in building your aquatic facility to be inclusive to more programs? Have you ever considered synchronized swimming? As any other sport, synchronized swimming has its rulebook it must follow as does its facility for official competition. Oftentimes, a synchronized swimming event can be conducted in the same facility as a certified competitive swimming facility. There are design requirements to consider when building your aquatic facility to ensure it can accommodate synchronized swimming programs.

First, let’s look at some design elements in a synchronized swimming pool that closely align to what is seen in a competitive swimming pool.

Temperature: Like other competitive swimmers, synchronized swimmers want a cooler pool when competing. A pool that is too cold shocks the swimmer and tightens the muscles at a time when the synchronized swimmer needs to be limber to perform. Water temperatures that are too warm, however, create an environment where it is easy for the swimmer to overheat, become sluggish and expend excess energy. The ideal temperature for synchronized swimming routines ranges between 79 to 82 degrees Fahrenheit.

Lane Design: In synchronized swimming, there is no use of lane ropes. The standard lane width for your competition pool will suffice. Though, it is important to note the overall pool dimensions recommended for competition. 8 to 10 lanes wide is most common. If performing in a 10-lane wide pool, the outside lane on either side can separated with a lane line to delineate the field of play.

Gutter Design: There are no official rules that call out a specific gutter type for synchronized swimming. There is, however, a suggested maximum deck to water height on the deep end wall where swimmers walk out on deck to dive. The proximity of the pool deck and water surface allow a more hands on approach for synchronized swimming coaches and ease in hearing coaches during swim practice. With this and personal experience, partially recessed or deck level gutters are good options for gutter types.

Lighting: Lighting is important for the performers, judges, and spectators. Nonetheless, the same lighting for competition swimming is also recommended for a synchronized swimming event.

Spectator Seating: Elevated seating is ideal for spectating synchronized swimming. In fact, judges’ seating is elevated to give the best viewing of the whole swim routine. Providing spectator seating on the second level also provides a better atmosphere for fans to comfortably take in the events.

Natatorium: One aspect to consider that can easily be forgotten are the plethora of sounds a natatorium must endure. Sporting events tend to have high volumes from spectators, announcers, coaches, and athletes. In addition to these noise contributors, there is music to accompany routines in synchronized swimming. Just as designing for any sport natatorium, it would be advantageous to work with an engineer who will pay attention to wall material and shape to dampen acoustics, identify ideal speaker placement and other elements to help manage acoustics in the natatorium.

Depending on the rulebooks used for your pool, the addition for synchronized swimming can be very simple. Following are some design aspects that may differ from a competitive swimming pool.

Pool dimensions: Synchronized swimming is competed in a competition pool. For high level competition, Fédération internationale de natation (FINA) requires the pool have a minimum area of 12 meters by 25 meters.

Water Depths: In the sport of synchronized swimming, the swimmers are not allowed to touch the bottom of the pool; this includes blatantly using the bottom or even accidentally brushing the bottom. If the pool floor is too shallow, it becomes an obstacle for swimmers. There are many times in a routine when swimmers need to be fully submerged and vertical. There are also times in preparation for lifts when swimmers need to be fully submerged while their bodies are compacted yet stacked 2 to 3 bodies in height.  Because of this, it is important there are sufficient depths in the pool to avoid disqualification. FINA recommends a minimum deep end depth of 8 foot 2 inches and a minimum shallow end depth of 5 foot 9 inches for competition.

Deck Dimensions: Synchronized swimming does prefer a sufficient deck space of at least 6 feet surrounding entire pool with one end free from obstacles for team entry.

Facilities: Unlike any other athletes, synchronized swimmers apply gel on their heads to hold their hair in place as they perform in water. It is important to consider the amount of space needed for competitors to gel their hair and apply makeup, as well as space needed to change into swimsuits. Tip: You can’t have too many mirrors! Not only should changing rooms be considered but other multipurpose rooms serve for landdrilling (practicing routines on land) or stretching.

Ultimately, providing opportunity for synchronized swimming can be a great and easy way to add to the multipurpose programming of your aquatic facility.

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GUEST BLOG: Know the Facts: Drowning Deaths and Injuries by Location

Many parents may think that the home is the safest place for a child, but 74 percent of drowning deaths involving children younger than 15 years old occur at a residence. Private homes rarely have lifeguards, and children can easily slip outside unnoticed when homes do not have door or window alarms.

Leveraging the Layers of Protection by Pool Type

Whether you have an in-ground, above-ground or portable pool at your home or in your community, it is critical that pool and spa owners install layers of protectionbetween the house and the water. Layers of protection can include a four-foot-tall, non-climbable fence with a self-closing, self-latching gate, alarms on all doors and windows leading from the house to the pool area and well-maintained pool and spa covers.

Portable and above-ground pool owners can take extra steps, as well. Empty portable pools after every use, and store them to keep kids safe and remove ladders from above-ground pools when they are not in use. All pool owners should make sure that neighbors, babysitters and visitors know that they have a pool in their yard and should always designate an adult Water Watcher when kids are in the pool.

Understanding the Law to Help Prevent Drowning Injuries

Similar to the data on drowning fatalities, the majority of nonfatal drownings occur in a residential setting. While it is important to follow the simple safety steps around all bodies of water, there is one distinction when it comes to water safety in public versus private pools: a federal law.

The Virginia Graeme Baker Pool and Spa Safety Act (VGBA) is a federal law that requires public pools and spas to have safer and compliant drain covers to avoid entrapment hazards. Entrapments occur when powerful suction from the water circulation system in a pool or spa causes someone to become trapped underwater.

Why is this important? Because no public pool or spa should be open if the facility is not compliant with this federal law.

While private/residential pools are not covered under the VGBA, Pool Safelyrecommends that they also have safer drains. Children should be taught to stay away from drains, filters and suction openings in pools and spas, because it is easy for long hair, jewelry and bathing suits to get caught in these drains.

In addition to making sure your children know how to Pool Safelyit is important for parents also to  confirm that all pools or spas they visit are VGB compliant.

*Data derived from the CPSC Submersion Report provides estimates and averages for drowning injuries and deaths. The report estimates pool and spa deaths involving children younger than 15 years of age between 2012 and 2014; for injuries for the same group, annual estimates are derived from years 2014 to 2016.

Thermoplastic Pipe Expansion

Swimming pool piping is design is notorious for including long straight runs of pipe.  For pools that do include long runs of straight pipe sections, consideration may be given to the use of expansion loops or mechanical expansion joints to accommodate thermal expansion and contraction.  The ASTM Standard 2774 references “Underground Installation of Thermoplastic Pressure Piping”. This ASTM Standard 2774 contains specific information on the topic of expansion in pool piping.  Expansion and contraction of thermoplastic pipe is typically due to temperature changes to either the surrounding pipe embedment materials or changes in the pool water traveling in the pipe system. When temperature changes of the thermoplastic pipe does occur, changes to the piping network in the form of elongation or contraction will occur.  Therefore, in piping networks where there may exist sections of the pipe that are straight and without bends, expansion and contraction of the pipe can cause failures in the system.  Swimming pool piping networks that include PVC pipe used in straight runs nearing 100 LF should take special consideration to the potential expansion and contraction of the pool pipe.  In these instances the design of the pool piping system should have the coefficient of expansion calculated for determination if design accommodations for the expansion and contraction should be included.

In cases where expansion and contraction will be significant, inclusion of an expansion loop or even a mechanical expansion joint can be installed.  A pipe loop is a relatively easy item to include within the piping network.   This pipe loop, or offset, can alleviate the bending stresses that can occur when thermoplastic piping systems experience expansion and contraction.  If expansion joints are required, a detail for the expansion loop may include a specific dimension for the offset lengths.  Mechanical expansion joints work like a piston allowing the pipe to elongate or contract within the pipe run.  The installation of mechanical expansion and contraction joints is critical, particularly cleaning debris (sand, rock, dirt) out of the moving parts.  If small particles come in contact with the mechanical joint mechanism the joints seal can become compromised.

In most instances a linear pipe runs without interruption of bends, joints or pipe size changes is not common.  However, in situations where conditions do allow long pipe runs, your design should pay special attention for need of expansion and contraction loops and mechanical joints.

Epoxy Grout

Tile, known for its longevity, has proven to be the most durable finish for pool interiors. Selecting the material, size, shape and color of the tile is just one step in the process. Another consideration is the grout selection. Grout can influence tile appearance significantly. If you choose the right grout, it can blend perfectly with the tile color. Or you can choose a contrasting color to highlight the tile. But that also requires an outstanding tile installation. Selecting your grout can be a very important decision as far as aesthetics go. Additionally, there are two different categories of grout; cementitious grout and epoxy grout. Both options are viable solutions for tiled pools, but with certain design parameters, one typically will make a better solution for a specific installation.
Cementitious grout, otherwise known as sanded grout, has been the longtime solution for pools. The cementitious grout can be applied at either indoor or outdoor pool locations, its color does not fade or change and it comes at a lower cost. But this product has also been noted to have a greater likelihood of having issues down the road. There are typically two main causes of failure, with the first being pool water chemistry. The water chemistry often gets exacerbated in spas due to calcium and/or acid issues. The water will begin to leech minerals from the tile grout, which makes the grout will need to be replaced sooner. The other main cause of failure are tile dots. The dots, in Counsilman-Hunsaker specification, have been limited to where they cannot occupy more than one-third of the depth of the tile. The grout is not allowed to occupy the depth or surface area needed to fill the space between tiles. It should be noted that the dots can still be an issue with the epoxy grouts, but it’s not as likely.
Epoxy grout, a product that has become more widely accepted by the aquatics industry as of 2010, is finding its way on more and more pool projects. The epoxy product is known to last longer, but tends to discolor and typically be more expensive. There will usually be a 25%-35% premium, plus additional installation and labor charges. Applications where movement is critical, such as second floors, are ideal installations for epoxy grout. The grout can be used in outdoor pool applications in freeze-thaw environments, however, certain conditions must exist:
• There cannot be a high-water table
• The tile must be porcelain
• The pool should be winterized with water in it (not completely drained)
The exterior application also brings the concern of fading dark colors over time, darkening of light colors over time and in cases where high MVER/high water table exists, the drain rate of the pool water for maintenance becomes just as critical as the fill rate (nothing greater than one-inch per hour).
In project applications where the budget is limited or in the case where minimum trim tile is being installed, the cementitious grout can be considered as a value engineer option.

Water Basketball Goals

Water basketball can occasionally become an afterthought during the commercial swimming pool design process due to its relatively low startup and maintenance costs. Furthermore, water basketball goals can be accommodated in a variety of places across a typical leisure pool and are hindered by the available water depth more than the available space. Often times, they are placed somewhere in the lap lane area of a pool because the larger amenities such as play structures, current channels, and water slides demand specific water depth and clearance requirements that don’t align with the ideal conditions for water basketball. Counsilman-Hunsaker has recognized a need to consider water basketball during the schematic design phase of a project with the type of water basketball goal specified becoming a function of the pool overflow system (gutter vs. skimmer), the ability to move the goal, and the desire to have an adjustable height goal. Each type of water basketball goal has its advantages and disadvantages that will be further discussed.

 

During initial phases of the design of a swimming pool, a “water basketball nook” should be considered accompanied by an on-looking underwater bench. By designating a confined area of the pool to water basketball, design teams can help mitigate un-desired interactions between calmer portions of the swimming pool and the unavoidable, yet popular, rowdy water basketball game. That being said, the type of water basketball goal to be specified for the pool contractor is determined by the pool overflow system. Water basketball goals have ideal setback distances from edge of the pool to the water basketball goal anchor. For example, SR Smith manufactures a water basketball goal known as the Swim N’ Dunk (S-BASK-ERS) with a setback distance of 18 inches. This smaller setback limits the type of pool that this particular goal can be installed on to skimmer pools. Obviously, the type of overflow system should not be a slave to the type of water basketball goal specified; however, it is important to keep these ideas in mind when discussing potential designs with a facility owner.

Figure 1: SR Smith Swim N’ Dunk Water Basketball Goal

 

Fortunately, SR Smith makes an extended reach model of the water basketball goal previously mentioned that increases the setback distance from the pool edge to 30 inches. The extended reach model could be used on a pool with a gutter perimeter overflow system, but it still lacks adjustability. The Spectrum Adjustable Basketball Hoop allows for the height of the water basketball goal to be raised and lowered. The Spectrum system uses a compression mechanism and two extension arms to do this. The setback distance for this goal is 26 inches and could be specified for a pool with a gutter system. Designers should keep this mechanism in mind when accounting for the surrounding deck space as the lever used to adjust the goal can have a large swing radius. It is important to note that any water basketball goal with an adjustable height should have a safety stopper to prevent the backboard from falling from its highest point. Without this safety implementation, backboards have been known to come crashing down on the coping stone below with some force.

Figure 2: Spectrum Adjustable Basketball Hoop

 

Both of the water basketball goals mentioned thus far have a fixed position. More specifically, they are anchored to the pool deck and, while they can be removed and stored, will more or less be there permanently.  Dunn-Rite, Inc. has a model known as the Splash and Slam that is both movable and has an adjustable height. The base of the water basketball goal is a hollowed polyethylene basin that weighs 500 pounds when filled with water. The water can then be drained to allow pool operators to move the goal. The backboard height can also be adjusted and leveled to compensate for the occasional uneven pool deck. This goal, while it has its advantages, would typically be specified if water basketball was considered as an afterthought during design. It is customizable, but lacks aesthetically and in sturdiness when compared to the fixed position goals.

Figure 3: Dunn Rite Splash and Slam

 

Water basketball goals should be a staple when it comes to leisure pool design because of their sheer popularity and low startup and upkeep cost. Ideally, the goal is placed in an area of the pool far away from where younger children will be playing and adults will be lounging. Different perimeter overflow systems demand different types of goals as fixed goals need to be provided with a deck mounted anchor. If all of these considerations are taken into account during the design phase of a project, water basketball can become the primary feature of a facility. They do bring with them many liability issues, but that is a topic for another discussion.